Abstract: The finite element simulation analysis model has been established by using full-scale general finite element software ANSYS, and the calculation and analysis on casting process of 0. 20C steel Φ600 mm round bloom and 40Cr steel Φ500 mm round bloom with casting rate 0. 25 ~0. 35 m/min and liquid overheating extent 20 ℃ has been carried out to get the curves of round bloom surface temperature changing at distance 0 ~ 32 m from liquid surface in casting process. Calculation results show that as the casting rate of 0. 20C steel Φ600 mm round bloom is 0. 3 m/min, the thickness of bloom shell at outlet of mold is 30. 9 mm, the bloom surface temperature at outlet of mold is 1 050 T and the lowest temperature of surface at secondary cooling zone is 978 ℃, the casting bloom solidifies in full at the distance 19. 71 m from liquid surface. The production practice by Φ600 mm round bloom caster casting 0. 20C steel show 由at with casting rate 0. 25 m/min, the surface temperature of casting bloom at outlet of mold is 1 048 °C and the lowest surface temperature of bloom in secondary cooling zone is 918 ℃ that are similar to simulated results.

摘要： 通过大型通用有限元软件ANSYS建立铸坯凝固过程有限元仿真分析模型,在拉速0.25～0.35m/min,钢水过热度20℃的条件下,对20钢Φ中600mm和40Cr钢Φ500 mm圆坯连铸过程进行了计算和分析,得出距液面0～32 m时铸坯表面温度变化曲线。计算结果表明,当20钢Φ600 mm圆坯的拉速为0.3 m/min时,结晶器出口坯壳厚度为30.9 mm,结晶器出口铸坯温度为1050℃,二冷区表面最低温度978℃铸坯在距液面19.71 mm处完全凝固。Φ600 mm圆坯连铸机20钢生产实践表明,拉速0.25 m/min,结晶器出口铸坯表面温度为1048℃,二冷区表面最低温度为918℃,与模拟结果相似。

关键词: 大圆坯, 连铸, 温度场, 数值模拟